Norepinephrine solution is available in 4 mL ampoules containing 1 mg of norepinephrine per mL. The solution must be diluted prior to administration. If a physician orders a 1.6 mg% (w/v) dilution in sodium chloride injection, how many mL of the sodium chloride injection must be added to the contents of one 4-mL ampule? Round your answer to the nearest whole milliliter.

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